Why glTransformFeedbackVaryings not Exists in QT?

[wwolff]

Hi!

I´m using QT to develop OpenGL aplications but i cannot use the glTransformFeedbackVaryings function to get my transformations feedback.

Looking at the function specification, this function start to be a part of core profile from 4.1 version of OpenGL, but in all QOpenGLFunctions Objetcs , many of this functions simply not exists including the 4.1,4.2 and 4.3 objects.

How can i solve it?

Kind Reagards.

[napajejenunedk0]

Are you using the wrangler library for extracting OpenGL function pointers?

[wwolff]

In fact all my Objects that use OpenGL Commands are being inherited from QOpenGLFunctions Object , including my Widget all the code are working fine, but , now i´m trying collect the transformed vertices from the OpenGL pipeline, But when i try use this function it doesnt find anything...return to me not find the function...

Kind Regards.

[napajejenunedk0]

Yes ... try using the wrangler library inside your project. Pure OpenGL calls are limited to OpenGL 1.1 (in Windows environment), so to extract pointers to the hardware-implemented functions of your GPU you should make the "GLEW":http://glew.sourceforge.net/ part of your project.

[wwolff]

Ok, i will try.
Thanks so much for your help.

Regards.